Sorry about the outage.
I rebooted the server, and apparently it didn't come back up. I still don't know what its problem was.
Instead of "seeing it back up" before I ran off, I forgot all about it and went outside to do some work, eat dinner, etc. and fortunately decided to check my e-mail before I spent yet another good half hour away from my computer!
I hate it when I do stuff like that.